Chem 128b

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Author:
shutterbug81
ID:
102700
Filename:
Chem 128b
Updated:
2011-09-19 00:00:12
Tags:
ochem
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Description:
ochem
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  1. Carbonyl Group
    • Carboxylic Acid
    • OH present
    • Strong 3300-2500
    • Amide
    • Medium broad absorption 3500-3300
    • Tertiary amide
    • Do not show any strong absorption
    • Acetic anhydride
    • Two strong C=O absorption near 1810 and 1760 cm-1
    • Ketones
    • other 5 options have been eliminated
    • Alcohol
    • • Strong, broad absorption; region 3650 - 3200 cm-1
    • • Confirm by finding strong νC-O in the region 1250 - 1050 cm-1
    • Phenol
    • C=O and OH
  2. Phenol
    • Amine
    • • Is N-H present?
    • • Medium, broad absorption; region 3500 - 3300 cm-1
    • • Sometimes a double peak with equivalent halves
    • • Confirm by finding strong νC-O in the region 1250 - 1050 cm-1
    • • Absence of νO-H
    • Double Bond
    • • ν C=C: weak absorption, 1680 - 1600 cm-1
    • • Aromatic rings: medium to strong, 1650 - 1450 cm-1
    • • Aromatic and vinyl νC(sp2)-H: to the left of 3000 cm-1
    • • Aliphatic νC(sp3)-H: to the right of 3000 cm-1
    • Aromatic Ring
    • • ν C=C: weak absorption, 1680 - 1600 cm-1
    • • Aromatic rings: medium to strong, 1650 - 1450 cm-1
    • • Aromatic and vinyl νC(sp2)-H: to the left of 3000 cm-1
    • • Aliphatic νC(sp3)-H: to the right of 3000 cm-1
    • Triple Bond
    • • ν C≡C: medium,sharp absorption, 2260 - 2100 cm-1
    • • Check for νC(sp)-H near 3300 cm-1

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